mirror of
https://github.com/VictoriaMetrics/VictoriaMetrics.git
synced 2024-11-27 02:46:47 +01:00
f325410c26
- Return meta-labels for the discovered targets via promutils.Labels instead of map[string]string. This improves the speed of generating meta-labels for discovered targets by up to 5x. - Remove memory allocations in hot paths during ScrapeWork generation. The ScrapeWork contains scrape settings for a single discovered target. This improves the service discovery speed by up to 2x.
561 lines
15 KiB
Go
561 lines
15 KiB
Go
package promscrape
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import (
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"flag"
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"fmt"
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"io"
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"net/http"
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"regexp"
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"sort"
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"strconv"
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"strings"
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"sync"
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"time"
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"unsafe"
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"github.com/VictoriaMetrics/VictoriaMetrics/lib/fasttime"
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"github.com/VictoriaMetrics/VictoriaMetrics/lib/promrelabel"
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"github.com/VictoriaMetrics/VictoriaMetrics/lib/promutils"
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"github.com/cespare/xxhash/v2"
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)
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var maxDroppedTargets = flag.Int("promscrape.maxDroppedTargets", 1000, "The maximum number of droppedTargets to show at /api/v1/targets page. "+
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"Increase this value if your setup drops more scrape targets during relabeling and you need investigating labels for all the dropped targets. "+
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"Note that the increased number of tracked dropped targets may result in increased memory usage")
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var tsmGlobal = newTargetStatusMap()
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// WriteTargetResponse serves requests to /target_response?id=<id>
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//
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// It fetches response for the given target id and returns it.
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func WriteTargetResponse(w http.ResponseWriter, r *http.Request) error {
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targetID := r.FormValue("id")
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sw := tsmGlobal.getScrapeWorkByTargetID(targetID)
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if sw == nil {
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return fmt.Errorf("cannot find target for id=%s", targetID)
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}
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data, err := sw.getTargetResponse()
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if err != nil {
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return fmt.Errorf("cannot fetch response from id=%s: %w", targetID, err)
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}
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w.Header().Set("Content-Type", "text/plain; charset=utf-8")
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_, err = w.Write(data)
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return err
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}
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// WriteHumanReadableTargetsStatus writes human-readable status for all the scrape targets to w according to r.
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func WriteHumanReadableTargetsStatus(w http.ResponseWriter, r *http.Request) {
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filter := getRequestFilter(r)
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tsr := tsmGlobal.getTargetsStatusByJob(filter)
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if accept := r.Header.Get("Accept"); strings.Contains(accept, "text/html") {
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w.Header().Set("Content-Type", "text/html; charset=utf-8")
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WriteTargetsResponseHTML(w, tsr, filter)
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} else {
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w.Header().Set("Content-Type", "text/plain; charset=utf-8")
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WriteTargetsResponsePlain(w, tsr, filter)
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}
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}
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// WriteServiceDiscovery writes /service-discovery response to w similar to http://demo.robustperception.io:9090/service-discovery
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func WriteServiceDiscovery(w http.ResponseWriter, r *http.Request) {
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filter := getRequestFilter(r)
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tsr := tsmGlobal.getTargetsStatusByJob(filter)
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w.Header().Set("Content-Type", "text/html; charset=utf-8")
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WriteServiceDiscoveryResponse(w, tsr, filter)
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}
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// WriteAPIV1Targets writes /api/v1/targets to w according to https://prometheus.io/docs/prometheus/latest/querying/api/#targets
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func WriteAPIV1Targets(w io.Writer, state string) {
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if state == "" {
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state = "any"
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}
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fmt.Fprintf(w, `{"status":"success","data":{"activeTargets":`)
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if state == "active" || state == "any" {
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tsmGlobal.WriteActiveTargetsJSON(w)
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} else {
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fmt.Fprintf(w, `[]`)
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}
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fmt.Fprintf(w, `,"droppedTargets":`)
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if state == "dropped" || state == "any" {
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droppedTargetsMap.WriteDroppedTargetsJSON(w)
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} else {
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fmt.Fprintf(w, `[]`)
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}
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fmt.Fprintf(w, `}}`)
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}
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type targetStatusMap struct {
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mu sync.Mutex
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m map[*scrapeWork]*targetStatus
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jobNames []string
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}
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func newTargetStatusMap() *targetStatusMap {
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return &targetStatusMap{
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m: make(map[*scrapeWork]*targetStatus),
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}
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}
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func (tsm *targetStatusMap) Reset() {
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tsm.mu.Lock()
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tsm.m = make(map[*scrapeWork]*targetStatus)
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tsm.mu.Unlock()
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}
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func (tsm *targetStatusMap) registerJobNames(jobNames []string) {
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tsm.mu.Lock()
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tsm.jobNames = append(tsm.jobNames[:0], jobNames...)
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tsm.mu.Unlock()
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}
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func (tsm *targetStatusMap) Register(sw *scrapeWork) {
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tsm.mu.Lock()
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tsm.m[sw] = &targetStatus{
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sw: sw,
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}
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tsm.mu.Unlock()
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}
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func (tsm *targetStatusMap) Unregister(sw *scrapeWork) {
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tsm.mu.Lock()
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delete(tsm.m, sw)
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tsm.mu.Unlock()
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}
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func (tsm *targetStatusMap) Update(sw *scrapeWork, up bool, scrapeTime, scrapeDuration int64, samplesScraped int, err error) {
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tsm.mu.Lock()
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ts := tsm.m[sw]
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if ts == nil {
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ts = &targetStatus{
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sw: sw,
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}
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tsm.m[sw] = ts
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}
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ts.up = up
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ts.scrapeTime = scrapeTime
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ts.scrapeDuration = scrapeDuration
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ts.samplesScraped = samplesScraped
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ts.scrapesTotal++
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if !up {
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ts.scrapesFailed++
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}
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ts.err = err
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tsm.mu.Unlock()
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}
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func (tsm *targetStatusMap) getScrapeWorkByTargetID(targetID string) *scrapeWork {
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tsm.mu.Lock()
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defer tsm.mu.Unlock()
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for sw := range tsm.m {
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if getTargetID(sw) == targetID {
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return sw
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}
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}
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return nil
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}
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func getTargetID(sw *scrapeWork) string {
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return fmt.Sprintf("%016x", uintptr(unsafe.Pointer(sw)))
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}
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// StatusByGroup returns the number of targets with status==up
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// for the given group name
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func (tsm *targetStatusMap) StatusByGroup(group string, up bool) int {
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var count int
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tsm.mu.Lock()
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for _, ts := range tsm.m {
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if ts.sw.ScrapeGroup == group && ts.up == up {
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count++
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}
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}
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tsm.mu.Unlock()
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return count
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}
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func (tsm *targetStatusMap) getActiveTargetStatuses() []targetStatus {
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tsm.mu.Lock()
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tss := make([]targetStatus, 0, len(tsm.m))
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for _, ts := range tsm.m {
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tss = append(tss, *ts)
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}
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tsm.mu.Unlock()
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// Sort discovered targets by __address__ label, so they stay in consistent order across calls
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sort.Slice(tss, func(i, j int) bool {
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addr1 := tss[i].sw.Config.OriginalLabels.Get("__address__")
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addr2 := tss[j].sw.Config.OriginalLabels.Get("__address__")
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return addr1 < addr2
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})
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return tss
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}
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// WriteActiveTargetsJSON writes `activeTargets` contents to w according to https://prometheus.io/docs/prometheus/latest/querying/api/#targets
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func (tsm *targetStatusMap) WriteActiveTargetsJSON(w io.Writer) {
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tss := tsm.getActiveTargetStatuses()
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fmt.Fprintf(w, `[`)
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for i, ts := range tss {
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fmt.Fprintf(w, `{"discoveredLabels":`)
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writeLabelsJSON(w, ts.sw.Config.OriginalLabels)
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fmt.Fprintf(w, `,"labels":`)
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writeLabelsJSON(w, ts.sw.Config.Labels)
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fmt.Fprintf(w, `,"scrapePool":%q`, ts.sw.Config.Job())
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fmt.Fprintf(w, `,"scrapeUrl":%q`, ts.sw.Config.ScrapeURL)
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errMsg := ""
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if ts.err != nil {
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errMsg = ts.err.Error()
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}
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fmt.Fprintf(w, `,"lastError":%q`, errMsg)
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fmt.Fprintf(w, `,"lastScrape":%q`, time.Unix(ts.scrapeTime/1000, (ts.scrapeTime%1000)*1e6).Format(time.RFC3339Nano))
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fmt.Fprintf(w, `,"lastScrapeDuration":%g`, (time.Millisecond * time.Duration(ts.scrapeDuration)).Seconds())
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fmt.Fprintf(w, `,"lastSamplesScraped":%d`, ts.samplesScraped)
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state := "up"
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if !ts.up {
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state = "down"
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}
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fmt.Fprintf(w, `,"health":%q}`, state)
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if i+1 < len(tss) {
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fmt.Fprintf(w, `,`)
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}
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}
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fmt.Fprintf(w, `]`)
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}
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func writeLabelsJSON(w io.Writer, labels *promutils.Labels) {
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fmt.Fprintf(w, `{`)
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labelsList := labels.GetLabels()
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for i, label := range labelsList {
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fmt.Fprintf(w, "%q:%q", label.Name, label.Value)
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if i+1 < len(labelsList) {
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fmt.Fprintf(w, `,`)
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}
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}
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fmt.Fprintf(w, `}`)
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}
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type targetStatus struct {
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sw *scrapeWork
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up bool
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scrapeTime int64
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scrapeDuration int64
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samplesScraped int
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scrapesTotal int
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scrapesFailed int
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err error
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}
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func (ts *targetStatus) getDurationFromLastScrape() time.Duration {
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return time.Since(time.Unix(ts.scrapeTime/1000, (ts.scrapeTime%1000)*1e6))
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}
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type droppedTargets struct {
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mu sync.Mutex
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m map[uint64]droppedTarget
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lastCleanupTime uint64
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}
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type droppedTarget struct {
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originalLabels *promutils.Labels
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deadline uint64
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}
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func (dt *droppedTargets) getTargetsLabels() []*promutils.Labels {
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dt.mu.Lock()
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dtls := make([]*promutils.Labels, 0, len(dt.m))
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for _, v := range dt.m {
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dtls = append(dtls, v.originalLabels)
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}
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dt.mu.Unlock()
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// Sort discovered targets by __address__ label, so they stay in consistent order across calls
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sort.Slice(dtls, func(i, j int) bool {
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addr1 := dtls[i].Get("__address__")
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addr2 := dtls[j].Get("__address__")
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return addr1 < addr2
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})
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return dtls
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}
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func (dt *droppedTargets) Register(originalLabels *promutils.Labels) {
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// It is better to have hash collisions instead of spending additional CPU on promLabelsString() call.
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key := labelsHash(originalLabels)
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currentTime := fasttime.UnixTimestamp()
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dt.mu.Lock()
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if k, ok := dt.m[key]; ok {
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k.deadline = currentTime + 10*60
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dt.m[key] = k
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} else if len(dt.m) < *maxDroppedTargets {
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dt.m[key] = droppedTarget{
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originalLabels: originalLabels,
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deadline: currentTime + 10*60,
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}
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}
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if currentTime-dt.lastCleanupTime > 60 {
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for k, v := range dt.m {
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if currentTime > v.deadline {
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delete(dt.m, k)
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}
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}
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dt.lastCleanupTime = currentTime
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}
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dt.mu.Unlock()
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}
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func labelsHash(labels *promutils.Labels) uint64 {
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d := xxhashPool.Get().(*xxhash.Digest)
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for _, label := range labels.Labels {
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_, _ = d.WriteString(label.Name)
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_, _ = d.WriteString(label.Value)
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}
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h := d.Sum64()
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d.Reset()
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xxhashPool.Put(d)
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return h
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}
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var xxhashPool = &sync.Pool{
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New: func() interface{} {
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return xxhash.New()
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},
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}
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// WriteDroppedTargetsJSON writes `droppedTargets` contents to w according to https://prometheus.io/docs/prometheus/latest/querying/api/#targets
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func (dt *droppedTargets) WriteDroppedTargetsJSON(w io.Writer) {
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dtls := dt.getTargetsLabels()
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fmt.Fprintf(w, `[`)
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for i, labels := range dtls {
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fmt.Fprintf(w, `{"discoveredLabels":`)
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writeLabelsJSON(w, labels)
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fmt.Fprintf(w, `}`)
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if i+1 < len(dtls) {
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fmt.Fprintf(w, `,`)
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}
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}
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fmt.Fprintf(w, `]`)
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}
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var droppedTargetsMap = &droppedTargets{
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m: make(map[uint64]droppedTarget),
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}
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type jobTargetsStatuses struct {
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jobName string
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upCount int
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targetsTotal int
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targetsStatus []targetStatus
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}
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func (tsm *targetStatusMap) getTargetsStatusByJob(filter *requestFilter) *targetsStatusResult {
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byJob := make(map[string][]targetStatus)
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tsm.mu.Lock()
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for _, ts := range tsm.m {
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jobName := ts.sw.Config.jobNameOriginal
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byJob[jobName] = append(byJob[jobName], *ts)
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}
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jobNames := append([]string{}, tsm.jobNames...)
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tsm.mu.Unlock()
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var jts []*jobTargetsStatuses
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for jobName, statuses := range byJob {
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sort.Slice(statuses, func(i, j int) bool {
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return statuses[i].sw.Config.ScrapeURL < statuses[j].sw.Config.ScrapeURL
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})
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ups := 0
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var targetsStatuses []targetStatus
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for _, ts := range statuses {
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if ts.up {
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ups++
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}
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if filter.showOnlyUnhealthy && ts.up {
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continue
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}
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targetsStatuses = append(targetsStatuses, ts)
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}
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jts = append(jts, &jobTargetsStatuses{
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jobName: jobName,
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upCount: ups,
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targetsTotal: len(statuses),
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targetsStatus: targetsStatuses,
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})
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}
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sort.Slice(jts, func(i, j int) bool {
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return jts[i].jobName < jts[j].jobName
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})
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emptyJobs := getEmptyJobs(jts, jobNames)
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var err error
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jts, err = filterTargets(jts, filter.endpointSearch, filter.labelSearch)
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if len(filter.endpointSearch) > 0 || len(filter.labelSearch) > 0 {
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// Do not show empty jobs if target filters are set.
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emptyJobs = nil
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}
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dtls := droppedTargetsMap.getTargetsLabels()
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return &targetsStatusResult{
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jobTargetsStatuses: jts,
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droppedTargetsLabels: dtls,
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emptyJobs: emptyJobs,
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err: err,
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}
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}
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func filterTargetsByEndpoint(jts []*jobTargetsStatuses, searchQuery string) ([]*jobTargetsStatuses, error) {
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if searchQuery == "" {
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return jts, nil
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}
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finder, err := regexp.Compile(searchQuery)
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if err != nil {
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return nil, fmt.Errorf("cannot parse %s: %w", searchQuery, err)
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}
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var jtsFiltered []*jobTargetsStatuses
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for _, job := range jts {
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var tss []targetStatus
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for _, ts := range job.targetsStatus {
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if finder.MatchString(ts.sw.Config.ScrapeURL) {
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tss = append(tss, ts)
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}
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}
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if len(tss) == 0 {
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// Skip jobs with zero targets after filtering, so users could see only the requested targets
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continue
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}
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job.targetsStatus = tss
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jtsFiltered = append(jtsFiltered, job)
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}
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return jtsFiltered, nil
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}
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func filterTargetsByLabels(jts []*jobTargetsStatuses, searchQuery string) ([]*jobTargetsStatuses, error) {
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if searchQuery == "" {
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return jts, nil
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}
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var ie promrelabel.IfExpression
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if err := ie.Parse(searchQuery); err != nil {
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return nil, fmt.Errorf("cannot parse %s: %w", searchQuery, err)
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}
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var jtsFiltered []*jobTargetsStatuses
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for _, job := range jts {
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var tss []targetStatus
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for _, ts := range job.targetsStatus {
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labels := ts.sw.Config.Labels.GetLabels()
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if ie.Match(labels) {
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tss = append(tss, ts)
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}
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}
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if len(tss) == 0 {
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// Skip jobs with zero targets after filtering, so users could see only the requested targets
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continue
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}
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job.targetsStatus = tss
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jtsFiltered = append(jtsFiltered, job)
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}
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return jtsFiltered, nil
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}
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func filterTargets(jts []*jobTargetsStatuses, endpointQuery, labelQuery string) ([]*jobTargetsStatuses, error) {
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var err error
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jts, err = filterTargetsByEndpoint(jts, endpointQuery)
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if err != nil {
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return nil, err
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}
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jts, err = filterTargetsByLabels(jts, labelQuery)
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if err != nil {
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return nil, err
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}
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return jts, nil
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}
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func getEmptyJobs(jts []*jobTargetsStatuses, jobNames []string) []string {
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jobNamesMap := make(map[string]struct{}, len(jobNames))
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for _, jobName := range jobNames {
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jobNamesMap[jobName] = struct{}{}
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}
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for i := range jts {
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delete(jobNamesMap, jts[i].jobName)
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}
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emptyJobs := make([]string, 0, len(jobNamesMap))
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for k := range jobNamesMap {
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emptyJobs = append(emptyJobs, k)
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}
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sort.Strings(emptyJobs)
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return emptyJobs
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}
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type requestFilter struct {
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showOriginalLabels bool
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showOnlyUnhealthy bool
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endpointSearch string
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labelSearch string
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}
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func getRequestFilter(r *http.Request) *requestFilter {
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showOriginalLabels, _ := strconv.ParseBool(r.FormValue("show_original_labels"))
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showOnlyUnhealthy, _ := strconv.ParseBool(r.FormValue("show_only_unhealthy"))
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endpointSearch := strings.TrimSpace(r.FormValue("endpoint_search"))
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labelSearch := strings.TrimSpace(r.FormValue("label_search"))
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return &requestFilter{
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showOriginalLabels: showOriginalLabels,
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showOnlyUnhealthy: showOnlyUnhealthy,
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endpointSearch: endpointSearch,
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labelSearch: labelSearch,
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}
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}
|
|
|
|
type targetsStatusResult struct {
|
|
jobTargetsStatuses []*jobTargetsStatuses
|
|
droppedTargetsLabels []*promutils.Labels
|
|
emptyJobs []string
|
|
err error
|
|
}
|
|
|
|
type targetLabels struct {
|
|
up bool
|
|
discoveredLabels *promutils.Labels
|
|
labels *promutils.Labels
|
|
}
|
|
type targetLabelsByJob struct {
|
|
jobName string
|
|
targets []targetLabels
|
|
activeTargets int
|
|
droppedTargets int
|
|
}
|
|
|
|
func (tsr *targetsStatusResult) getTargetLabelsByJob() []*targetLabelsByJob {
|
|
byJob := make(map[string]*targetLabelsByJob)
|
|
for _, jts := range tsr.jobTargetsStatuses {
|
|
jobName := jts.jobName
|
|
for _, ts := range jts.targetsStatus {
|
|
m := byJob[jobName]
|
|
if m == nil {
|
|
m = &targetLabelsByJob{
|
|
jobName: jobName,
|
|
}
|
|
byJob[jobName] = m
|
|
}
|
|
m.activeTargets++
|
|
m.targets = append(m.targets, targetLabels{
|
|
up: ts.up,
|
|
discoveredLabels: ts.sw.Config.OriginalLabels,
|
|
labels: ts.sw.Config.Labels,
|
|
})
|
|
}
|
|
}
|
|
for _, labels := range tsr.droppedTargetsLabels {
|
|
jobName := labels.Get("job")
|
|
m := byJob[jobName]
|
|
if m == nil {
|
|
m = &targetLabelsByJob{
|
|
jobName: jobName,
|
|
}
|
|
byJob[jobName] = m
|
|
}
|
|
m.droppedTargets++
|
|
m.targets = append(m.targets, targetLabels{
|
|
discoveredLabels: labels,
|
|
})
|
|
}
|
|
a := make([]*targetLabelsByJob, 0, len(byJob))
|
|
for _, tls := range byJob {
|
|
a = append(a, tls)
|
|
}
|
|
sort.Slice(a, func(i, j int) bool {
|
|
return a[i].jobName < a[j].jobName
|
|
})
|
|
return a
|
|
}
|